﻿using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;
using UIWindows.Attributes;
using UIWindows.Enums;
using UIWindows.Models;
using XingLucifer.IBase;

namespace UIWindows.Domains
{
    public class ObjectContainer
    {
        private static List<MenuViewModel> _view = new List<MenuViewModel>();
        private static List<TaskEventModel> _event = new List<TaskEventModel>();
        private static ConcurrentDictionary<string, object> _singletons = new ConcurrentDictionary<string, object>();
        public static bool Init { get => true; }

        static ObjectContainer()
        {
            var types = Assembly.GetExecutingAssembly().GetTypes();
            var parameter = types.Where(t => t.IsClass && t.Name.Contains("ViewModel")).ToList();
            var page = types.Where(t => t.IsClass && t.GetCustomAttribute<ViewFeatureAttribute>() != null).ToList();
            var singleton = types.Where(t => t.IsClass && t.GetCustomAttribute<SingletonAttribute>() != null).ToList();
            foreach (var item in singleton)
            {
                _singletons.TryAdd(item.Name, Activator.CreateInstance(item));
            }
            foreach (var item in page)
            {
                var vfa = item.GetCustomAttribute<ViewFeatureAttribute>();
                var viewmodel = parameter.Where(t => t.Name == $"{item.Name}ViewModel").FirstOrDefault();
                MenuViewModel viewModel = new MenuViewModel()
                {
                    MenuName = vfa.MenuName,
                    MenuIcon = vfa.MenuIcon,
                    IsSingleton = vfa.IsSingleton,
                    Level = vfa.Level,
                    Index = vfa.Index,
                };
                if (viewModel.IsSingleton)
                {
                    if (viewmodel == null) throw new Exception("请新建视图模型");
                    var ps = viewmodel.GetConstructors()[^1].GetParameters();
                    List<object> plist = new();
                    foreach (var p in ps)
                    {
                        plist.Add(_singletons.ContainsKey(p.ParameterType.Name) ? _singletons[p.ParameterType.Name] : null);
                    }
                    UserControl obj = Activator.CreateInstance(item) as System.Windows.Controls.UserControl;
                    obj.DataContext = Activator.CreateInstance(viewmodel, plist.ToArray());
                    viewModel.Context = obj;
                }
                else
                {
                    viewModel.View = item;
                    viewModel.ViewModel = viewmodel;
                }
                _view.Add(viewModel);
            }
            _view.Sort((x, y) => x.CompareTo(y));
            var handlerTypes = types.Where(t => t.IsClass && t.GetCustomAttribute<TaskClassAttribute>() != null).ToList();
            foreach (var handlerType in handlerTypes)
            {
                MethodInfo method = handlerType.GetMethod("Handle");
                var pars = method.GetParameters();
                Type entityType = pars[0].ParameterType;
                var ps = handlerType.GetConstructors()[^1].GetParameters();
                List<object> plist = new List<object>();
                foreach (var p in ps)
                {
                    plist.Add(_singletons.ContainsKey(p.ParameterType.Name) ? _singletons[p.ParameterType.Name] : null);
                }
                var handler = Activator.CreateInstance(handlerType, plist.ToArray());
                _event.Add(new TaskEventModel()
                {
                    TaskObject = handler,
                    TaskType = handlerType.GetCustomAttribute<TaskClassAttribute>().TaskType,
                    Handle = handler.GetType().GetMethod("Handle")
                });
            }
        }

        public static IList<MenuModel> GetMenuList(AuthorityTypes type) => _view.Where(x => (x.Level & type) != AuthorityTypes.无权限).Select(x => new MenuModel() { Name = x.MenuName, Icon = x.MenuIcon }).ToList();

        public static TaskEventModel ResolveEvent(XingLucifer.IBase.Enums.TaskTypes type) => _event.Where(x => x.TaskType == type).FirstOrDefault();

        private static UserControl _viewCache;
        public static object ResolvePage(string key)
        {
            ShowLoad(x => x.UnLoad());
            var model = _view.FirstOrDefault(x => x.MenuName == key);
            if (model == null) return null;
            if (model.IsSingleton)
            {
                _viewCache = model.Context;
                ShowLoad(x => x.Load());
                return model.Context;
            }
            var ps = model.ViewModel.GetConstructors()[^1].GetParameters();
            List<object> plist = new List<object>();
            foreach (var p in ps)
            {
                plist.Add(_singletons.ContainsKey(p.ParameterType.Name) ? _singletons[p.ParameterType.Name] : null);
            }
            UserControl obj = Activator.CreateInstance(model.View) as System.Windows.Controls.UserControl;
            obj.DataContext = Activator.CreateInstance(model.ViewModel, plist.ToArray());
            _viewCache = obj;
            ShowLoad(x => x.Load());
            return obj;
        }

        private static void ShowLoad(Action<IViewStatus> action)
        {
            if (_viewCache?.DataContext is IViewStatus status)
            {
                action?.Invoke(status);
            }
        }

        public static T ResolveSingleton<T>() where T : new() => (T)(_singletons.ContainsKey(typeof(T).Name) ? _singletons[typeof(T).Name] : default);
    }
}
